5-lipoxygenease inhibitors

ABSTRACT

Compounds of the Formula I: ##STR1## are inhibitors of the mammalian 5-lipoxygenase enzyme system of the arachidonic acid cascade. As such, these compounds are useful therapeutic agents for treating allergic conditions, asthma, cardiovascular disorders and inflammation.

This is a divisional of U.S. Ser. No. 660,595 filed Oct. 15, 1984, now U.S. Pat. No. 4,634,766 which is a C-I-P of U.S. Ser. No. 547,161, filed Oct. 31, 1983, now abandoned.

U.S. Pat. No. 4,634,766 (Atkinson, et al.) is incorporated herein by reference in its entirety.

SUMMARY OF THE INVENTION

The present invention relates to pharmaceutical compositions containing a compound of the Formula I: ##STR2## or a phrmaceutically acceptable salt thereof, a method of treatment using said composition and novel compounds encompassed by Formula I.

One embodiment of the present invention is a pharmaceutical composition useful for inhibiting leukotriene biosynthesis or action containing a compound of the Formula I: ##STR3## or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier, wherein:

Z is O, NCN, S, SO or SO₂ ;

R₁ is H, C₁ to C₆ alkyl, benzyl, C₁ to C₆ acyl, C₁ to C₆ lower aminoacyl, C₁ to C₆ alkylacyloxy-C₁ to C₆ alkyl (for example, --CH(CH₃)OCOC(CH₃)₃), C₁ to C₆ alkoxy-C₁ to C₆ alkyl (for example, --CH(CH₃)OC₂ H₅), --(CH₂)_(n) COOR₆ wherein n is 0 to 4, CN, C₁ to C₆ alkylacyloxy-C₁ to C₆ alkoxycarbonyl (e.g. --COOCH(O₂ CCH₃)CH₃), --C(R₇)═C(R₇)COOR₆ or SO₂ R₁₀ ;

R₂, R₃, R₄ and R₅ are each independently selected from:

(1) hydrogen;

(2) C₁ to C₆ alkyl;

(3) C₂ to C₆ alkenyl;

(4) --(CH₂)_(n) M wherein: n is 0 to 6 and M is

(a) OR₁₆ ;

(b) halogen;

(c) CF₃ ;

(d) SR₁₆ ;

(e) phenyl;

(f) substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆ ;

(g) COOR₆ ;

(h) ##STR4## (i) tetrazole; (j) ##STR5## (k) NR₈ R₉ ; (l) NHSO₂ R₁₀ ;

(m) ##STR6## (n) SOR₁₁ wherein R₁₁ is C₁ to C₆ alkyl, phenyl, substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆, (CH₂)_(m) COOR₆ wherein m is 1 to 6, or CF₃ ;

(o) CONR₈ R₉ ;

(p) SO₂ NR₈ R₉ ;

(q) SO₂ R₁₃ wherein R₁₃ is OH, C₁ to C₆ alkyl, H, phenyl, substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆, (CH₂)_(m) COOR₆ wherein m is 1 to 6, or CF₃ ;

(r) NO₂ ; ##STR7## (v) --CN; each R₁₆ is independently H; C₁ to C₆ -alkoxy-C₁ to C₆ alkyl; C₁ to C₆ alkylacyloxy-C₁ to C₆ alkyl; C₁ to C₆ alkyl; substituted phenyl wherein the substituents are C₁ to C₃ alkyl, halogen, CN, C₁ to C₃ alkoxy, OH, (CH₂)_(n) NR₈ R₉ wherein n is 0 to 2, CF₃, COOR₆, CH₂ COOR₆ ; --(CH₂)_(m) COOR₆ wherein m is 0 to 6; CN; C₁ to C₅ alkylacyl; C₁ to C₄ perfluoroalkyl; phenyl; benzyl; or CH₂ -R₁₂ wherein R₁₂ is C₁ to C₅ alkyldimethylamino;

each R₆ is independently H, C₁ to C₆ alkyl, benzyl or phenyl;

each R₁₄ is independently H, C₁ to C₆ alkyl, C₁ to C₆ alkoxy, C₁ to C₆ alkylacyloxy-C₁ to C₆ alkoxy, (CH₂)_(n) COOR₆ wherein n is 0 to 4, phenyl, substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆, or is such that R₁₄ COOH is an essential amino acid;

each R₈ and R₉ is independently H, phenyl, substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆, or C₁ to C₄ alkyl, or R₈ and R₉ may be joined through the N to form a heterocycloalkyl of 5 to 8 ring atoms (for example, pyrrolidino, piperidino); and

each R₇ is independently H, C₁ to C₆ alkyl, benzyl, phenyl or C₁ to C₆ alkylacyloxy-C₁ to C₆ alkoxy;

each R₁₀ is independently OH, C₁ to C₆ alkyl, C₁ to C₆ alkoxy, phenyl or p-tolyl;

or any two of R₁, R₂, R₃, R₄ or R₅ may be joined to form an additional ring of 5 to 7 members, said ring optionally containing a carbonyl group as a substituent, optionally containing a hydroxyl group as a substituent, and optionally having 1 or 2 double bonds, wherein if R₁ is a constituent of the ring, one member is nitrogen and the others are carbon and if R₁ is not a constituent of the ring, all the members are carbon; and T is hydrogen or OR₁₅ wherein R₁₅ is hydrogen, C₁ to C₆ alkyl, C₁ to C₆ alkylacyl, phenyl-C₁ to C₈ -alkylacyl, SO₂ R₁₀, arylsulfonyl, --CO-phenyl or substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆.

A preferred embodiment of the Formula I compounds is one wherein Z is O, S, SO or SO₂ and wherein n is 0 or 1 in the unit --(CH₂)_(n) M. A more preferred embodiment is wherein Z is O, S, SO or SO₂ and wherein n is 0 (zero) in the unit --(CH₂)_(n) M. In both of these embodiments, the remaining substituents are as defined for Formula I.

Another preferred embodiment of the Formula I compounds is one wherein:

Z is O or S;

R₁ is H, C₁ to C₆ alkyl, C₁ to C₆ acyl, --(CH₂)_(n) COOR₆ wherein n is 0 to 4, C₁ to C₆ alkylacyloxy-C₁ to C₆ alkoxycarbonyl (e.g. --COOCH(O₂ CCH₃)CH₃), --C(H)═C(H)COOR₆, or SO₂ R₁₀ ;

R₂, R₃, R₄ and R₅ are each independently selected from:

(1) hydrogen;

(2) C₁ to C₆ alkyl;

(3) --(CH₂)_(n) M wherein: n is 0 and M is

(a) OR₁₆ ;

(b) halogen;

(c) CF₃ ;

(d) NO₂ ; ##STR8## each R₁₆ is independently H; C₁ to C₆ -alkoxy-C₁ to C₆ alkyl; C₁ to C₆ alkylacyloxy-C₁ to C₆ alkyl; C₁ to C₆ alkyl; benzyl; phenyl; substituted phenyl wherein the substituents are C₁ to C₃ alkyl, halogen, CN, C₁ to C₃ alkoxy, OH, (CH₂)_(n) NR₈ R₉ wherein n is 0 to 2, CF₃, COOR₆, CH₂ COOR₆ ; --(CH₂)_(m) COOR₆ wherein m is 0 to 6; CN; C₁ to C₅ alkylacyl; C₁ to C₄ perfluoroalkyl; or CH₂ -R₁₂ wherein R₁₂ is C₁ to C₅ alkyldimethylamino;

each R₆ is independently H, C₁ to C₆ alkyl, benzyl or phenyl;

each R₁₄ is independently H, C₁ to C₆ alkyl, C₁ to C₆ alkoxy, C₁ to C₆ alkylacyloxy-C₁ to C₆ alkoxy, (CH₂)_(n) COOR₆ wherein n is 0 to 4, phenyl, substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆, or is such that R₁₄ COOH is an essential amino acid;

each R₈ and R₉ is independently H, phenyl, substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆ or C₁ to C₄ alkyl, or R₈ and R₉ may be joined through the N to form a heterocycloalkyl of 5 to 8 ring atoms (for example, pyrrolidino, piperidino); and

each R₇ is independently H, C₁ to C₆ alkyl, benzyl, phenyl or C₁ to C₆ alkylacyloxy-C₁ to C₆ alkoxy; and

each R₁₀ is independently OH, C₁ to C₆ alkyl, C₁ to C₆ alkoxy, phenyl or p-tolyl;

T is hydrogen or OR₁₅ wherein R₁₅ is hydrogen, C₁ to C₆ alkyl, C₁ to C₆ alkylacyl, phenyl-C₁ to C₈ -alkylacyl, SO₂ R₁₀, arylsulfonyl, --CO-phenyl or substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆ ; with the proviso that there is a group OR₁₆ located at one of the 6, 7, 8 or 9-positions. 

What is claimed is:
 1. A method of inhibiting mammalian leukotriene biosynthesis or action which comprises administering to a patient a pharmaceutically effective amount of a composition comprising an effective amount of a compound of Formula I: ##STR9## or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier, wherein:Z is O, NCN, S, SO or SO₂ ; R₁ is H, C₁ to C₆ alkyl, benzyl, C₁ to C₆ acyl, C₁ to C₆ lower aminoacyl, C₁ to C₆ alkylacyloxy-C₁ to C₆ alkyl, C₁ to C₆ alkoxy-C₁ to C₆ alkyl, --(CH₂)_(n) COOR₆ wherein n is 0 to 4, CN, C₁ to C₆ alkylacyloxy-C₁ to C₆ alkoxycarbonyl, --C(R₇)═C(R₇)COOR₆ or SO₂ R₁₀ ; R₂, R₃, R₄ and R₅ are each independently selected from:(1) hydrogen; (2) C₁ to C₆ alkyl; (3) C₂ to C₆ alkenyl; (4) --CH₂)_(n) M wherein: n is 0 to 6 and M is(a) OR₁₆ ; (b) halogen; (c) CF₃ ; (d) SR₁₆ ; (e) phenyl; (f) substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆ ; (g) COOR₆ ; (h) ##STR10## (i) tetrazole; (j) ##STR11## (k) NR₈ R₉ ; (l) NHSO₂ R₁₀ ; (m) ##STR12## (n) SOR₁₁ wherein R₁₁ is C₁ to C₆ alkyl, phenyl, substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆, (CH₂)_(m) COOR₆ wherein m is 1 to 6, or CF₃ ; (o) CONR₈ R₉ ; (p) SO₂ NR₈ R₉ ; (q) SO₂ R₁₃ wherein R₁₃ is OH, C₁ to C₆ alkyl, H, phenyl, substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆, (CH₂)_(m) COOR₆ wherein m is 1 to 6, or CF₃ ; (r) NO₂ ; ##STR13## (v) --CN; each R₁₆ is independently H; C₁ to C₆ -alkoxy-C₁ to C₆ alkyl; C₁ to C₆ alkylacyloxy-C₁ to C₆ alkyl; C₁ to C₆ alkyl; substituted phenyl wherein the substituents are C₁ to C₃ alkyl, halogen, CN, C₁ to C₃ alkoxy, OH, (CH₂)_(n) NR₈ R₉ wherein n is 0 to 2, CF₃, COOR₆, or CH₂ COOR₆ ; --(CH₂)_(m) COOR₆ wherein m is 0 to 6; CN; C₁ to C₅ alkylacyl; C₁ to C₄ perfluoroalkyl; phenyl; benzyl; or CH₂ -R₁₂ wherein R₁₂ is C₁ to C₅ alkyldimethylamino; each R₆ is independently H, C₁ to C₆ alkyl, benzyl or phenyl; each R₁₄ is independently H, C₁ to C₆ alkyl, C₁ to C₆ alkoxy, C₁ to C₆ alkylacyloxy-C₁ to C₆ alkoxy, (CH₂)_(n) COOR₆ wherein n is 0 to 4, phenyl, substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆, or is such that R₁₄ COOH is an essential amino acid; each R₈ and R₉ is independently H, phenyl, substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆ or C₁ to C₄ alkyl, or R₈ and R₉ may be joined through the N to form a heterocycloalkyl of 5 to 8 ring atoms; and each R₇ is independently H, C₁ to C₆ alkyl, benzyl, phenyl or C₁ to C₆ alkylacyloxy-C₁ to C₆ alkoxy; each R₁₀ is independently OH, C₁ to C₆ alkyl, C₁ to C₆ alkoxy, phenyl or p-tolyl;or any two of R₁, R₂, R₃, R₄ or R₅ may be joined to form an additional ring of 5 to 7 members, said ring optionally containing a carbonyl group as a substituent, optionally containing a hydroxyl group as a substituent, and optionally having 1 or 2 double bonds, wherein if R₁ is a constituent of the ring, one member is nitrogen and the others are carbon and if R₁ is not a constituent of the ring, all the members are carbon; and T is hydrogen or OR₁₅ wherein R₁₅ is hydrogen, C₁ to C₆ alkyl, C₁ to C₆ alkylacyl, phenyl-C₁ to C₈ -alkylacyl, SO₂ R₁₀, arylsulfonyl, --CO-phenyl or substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆.
 2. A method of claim 1 wherein Z is O.
 3. A method of claim 1 wherein Z is S, SO or SO₂.
 4. A method of claim 1 wherein Z is NCN.
 5. A method of claim 1, wherein Z is O, S, SO or SO₂ and wherein n is 0 or 1 in the unit --(CH₂)_(n) M.
 6. A method of claim 5, wherein n is
 0. 7. A method of claim 1, wherein:Z is O or S; R₁ is H, C₁ to C₆ alkyl, C₁ to C₆ acyl, --(CH₂)_(n) COOR₆ wherein n is 0 to 4, C₁ to C₆ alkylacyloxy-C₁ to C₆ alkoxycarbonyl, --C(H)═C(H)COOR₆, or SO₂ R₁₀ ; R₂, R₃, R₄ and R₅ are each independently selected from:(1) hydrogen; (2) C₁ to C₆ alkyl; (3) --(CH₂)_(n) M wherein: n is 0 and M is(a) OR₁₆ ; (b) halogen; (c) CF₃ ; (d) NO₂ ; ##STR14## each R₁₆ is independently H; C₁ to C₆ -alkoxy-C₁ to C₆ alkyl; C₁ to C₆ alkylacyloxy-C₁ to C₆ alkyl; C₁ to C₆ alkyl; benzyl; phenyl; substituted phenyl wherein the substituents are C₁ to C₃ alkyl, halogen, CN, C₁ to C₃ alkoxy, OH, (CH₂)_(n) NR₈ R₉ wherein n is 0 to 2, CF₃, COOR₆, or CH₂ COOR₆ ; --(CH₂)_(m) COOR₆ wherein m is 0 to 6; CN; C₁ to C₅ alkylacyl; C₁ to C₄ perfluoroalkyl; or CH₂ -R₁₂ wherein R₁₂ is C₁ to C₅ alkyldimethylamino; each R₆ is independently H, C₁ to C₆ alkyl, benzyl or phenyl; each R₁₄ is independently H, C₁ to C₆ alkyl, C₁ to C₆ alkoxy, C₁ to C₆ alkylacyloxy-C₁ to C₆ alkoxy, (CH₂)_(n) COOR₆ wherein n is 0 to 4, phenyl, substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆, or is such that R₁₄ COOH is an essential amino acid; each R₈ and R₉ is independently H, phenyl, substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆ or C₁ to C₄ alkyl, or R₈ and R₉ may be joined through the N to form a heterocycloalkyl of 5 to 8 ring atoms; and each R₇ is independently H, C₁ to C₆ alkyl, benzyl, phenyl or C₁ to C₆ alkylacyloxy-C₁ to C₆ alkoxy; and each R₁₀ is independently OH, C₁ to C₆ alkyl, C₁ to C₆ alkoxy, phenyl or p-tolyl; T is hydrogen or OR₁₅ wherein R₁₅ is hydrogen, C₁ to C₆ alkyl, C₁ to C₆ alkylacyl, phenyl-C₁ to C₈ -alkylacyl, SO₂ R₁₀, arylsulfonyl, --CO-phenyl or substituted phenyl wherein substituted phenyl is as defined in the definition of R₁₆ ;with the proviso that there is a group OR₁₆ located at one of the 6, 7, 8 or 9-positions.
 8. A method of claim 1 wherein the Formula I substituents are selected from:

    __________________________________________________________________________     Z    R.sub.1   R.sub.2                                                                             R.sub.3                                                                             R.sub.4                                                                             R.sub.5                                                                            T                                            __________________________________________________________________________     S    H         H    H    H    H   H                                            S    CH.sub.3  H    H    H    H   H                                            S    CH.sub.2 Ph                                                                              H    H    H    H   H                                            S    H         3-NO.sub.2                                                                          H    H    H   H                                            S    H         2-Cl 3-Cl H    H   H                                            S    H         3-NO.sub.2                                                                          7-NO.sub.2                                                                          H    H   H                                            S    CH.sub.3  2-NO.sub.2                                                                          H    H    H   H                                            S    CH.sub.3  3-NO.sub.2                                                                          H    H    H   H                                            S    n-C.sub.3 H.sub.7                                                                        2-Cl 3-Cl H    H   H                                            S    n-C.sub.6 H.sub.13                                                                       2-Cl 3-Cl H    H   H                                            S    CH.sub.2 Ph                                                                              2-Cl 3-Cl H    H   H                                            SO   H         H    H    H    H   H                                            SO   CH.sub.3  H    H    H    H   H                                            SO   H         2-Cl 3-Cl H    H   H                                            SO   H         3-NO.sub.2                                                                          7-NO.sub.2                                                                          H    H   H                                            SO.sub.2                                                                            CH.sub.3  H    H    H    H   H                                            SO.sub.2                                                                            CH.sub.2 Ph                                                                              H    H    H    H   H                                            SO.sub.2                                                                            CH.sub.2 Ph                                                                              2-Cl 3-Cl H    H   H                                            O    H         H    H    H    H   H                                            O    H         2-F  3-F  H    H   H                                            O    H         2-Cl 3-Cl H    H   H                                            O    H         2-Br 3-Br H    H   H                                            O    H         2-Cl 3-Cl 8-CH.sub.3                                                                          H   H                                            N--CN                                                                               H         H    H    H    H   H                                            N--CN                                                                               CH.sub.3  2-CH.sub.3                                                                          3-CH.sub.3                                                                          H    H   H                                            N--CN                                                                               CH.sub.3  H    H    H    H   7-OCH.sub.3                                  S    H         H    H    H    H   7-OCH.sub.3                                  S    H         H    H    H    8-Cl                                                                               7-OCH.sub.3                                  S    CH.sub.3  H    H    H    8-Cl                                                                               7-OCH.sub.3                                  S    CH.sub.3  H    H    H    8-Cl                                                                               7-OH                                         S    CH.sub.3  H    H    H    H   7-OCH.sub.3                                  S    H         H    H    H    H   7-OH                                         S    CH.sub.3  H    H    H    H   7-OH                                         SO   H         H    H    H    H   7-OCH.sub.3                                  SO   CH.sub.3  H    H    H    H   7-OCH.sub.3                                  S    SO.sub.2 Ph--p-Me                                                                        H    H    H    H   7-OCH.sub.3                                  SO.sub.2                                                                            H         H    H    H    H   7-OCH.sub.3                                  S    COCH.sub.3                                                                               H    H    H    H   7-OCH.sub.3                                  S    COCH.sub.3                                                                               H    H    H    H   H                                            SO.sub.2                                                                            H         H    H    H    H   H                                            S    CH.sub.2 CO.sub.2 C.sub.2 H.sub.5                                                        H    H    H    H   H                                            S    CH.sub.2 CO.sub.2 H                                                                      H    H    H    H   H                                            S    CO.sub.2 CH.sub.3                                                                        H    H    H    H   H                                            S    CH═CHCO.sub.2 CH.sub.3                                                               H    H    H    H   H                                            S    H         2-Cl H    H    H   H                                            S    H         3-Cl H    H    H   H                                            S    H         8-Cl H    H    H   H                                            S    H         2-Me H    H    H   H                                            S    H         H    H    H    H   7-OCH.sub.3                                  S    H         H    H    H    8-Cl                                                                               7-OCH.sub.3                                  __________________________________________________________________________


9. A method of claim 1 wherein the Formula I substituents are selected from:

    ______________________________________                                         Z    R.sub.1       R.sub.2                                                                               R.sub.3                                                                             R.sub.4                                                                             R.sub.5                                                                              T                                    ______________________________________                                         S    CH.sub.3      H      H    H    8-Cl  7-OCH.sub.3                          S    CH.sub.3      H      H    H    8-Cl  7-OH                                 S    CH.sub.3      H      H    H    H     7-OCH.sub.3                          S    H             H      H    H    H     7-OH                                 S    CH.sub.3      H      H    H    H     7-OH                                 SO   H             H      H    H    H     7-OCH.sub.3                          SO   CH.sub.3      H      H    H    H     7-OCH.sub.3                          S    SO.sub.2 Ph--p-Me                                                                            H      H    H    H     7-OCH.sub.3                          SO.sub.2                                                                            H             H      H    H    H     7-OCH.sub.3                          S    COCH.sub.3    H      H    H    H     7-OCH.sub.3                          S    COCH.sub.3    H      H    H    H     H                                    SO.sub.2                                                                            H             H      H    H    H     H                                    S    CH.sub.2 CO.sub.2 C.sub.2 H.sub.5                                                            H      H    H    H     H                                    S    CH.sub.2 CO.sub.2 H                                                                          H      H    H    H     H                                    S    CO.sub.2 CH.sub.3                                                                            H      H    H    H     H                                    S    CH═CHCO.sub.2 CH.sub.3                                                                   H      H    H    H     H                                    ______________________________________                                    


10. A method of claim 9 wherein the compound is 7-methoxy-1,4-diaza-10-methylphenothiazine.
 11. A method of claim 9 wherein the compound is 7-hydroxy-1,4-diaza-10H-phenothiazine.
 12. A method of claim 9 wherein the compound is 7-hydroxy-1,4-diaza-10-methylphenothiazine.
 13. A method of claim 9 wherein the compound is 8-chloro-1,4-diaza-7-methoxyphenothiazine.
 14. A method of claim 9 wherein the compound is 8-chloro-7-methoxy-1,4-diaza-10-methylphenothiazine.
 15. A method of claim 9 wherein the compound is 8-chloro-7-hydroxy-1,4-diaza-10-methylphenothiazine.
 16. A method of claim 1 wherein pulmonary conditions are treated or ameliorated.
 17. A method of claim 1 wherein inflammation is treated.
 18. A method of claim 1 wherein allergies are treated.
 19. A method of claim 1 wherein skin conditions are treated.
 20. A pharmaceutical composition for inhibiting leukotriene biosynthesis or action comprising an effective amount of a compound of the Formula I': ##STR15## or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier, wherein the Formula I' substituents are selected from:

    ______________________________________                                         Z        R.sub.1         R.sub.5  T                                            ______________________________________                                         S        H               H        7-OCH.sub.3                                  S        H               8-Cl     7-OCH.sub.3                                  S        CH.sub.3        8-Cl     7-OCH.sub.3                                  S        CH.sub.3        8-Cl     7-OH                                         S        CH.sub.3        H        7-OCH.sub.3                                  S        H               H        7-OH                                         S        CH.sub.3        H        7-OH                                         SO       H               H        7-OCH.sub.3                                  SO       CH.sub.3        H        7-OCH.sub.3                                  S        SO.sub.2 Ph--p-Me                                                                              H        7-OCH.sub.3                                  SO.sub.2 H               H        7-OCH.sub.3                                  S        COCH.sub.3      H        7-OCH.sub.3                                  S        COCH.sub.3      H        H                                            S        CH.sub.2 CO.sub.2 C.sub.2 H.sub.5                                                              H        H                                            S        CH.sub.2 CO.sub.2 H                                                                            H        H                                            S        CO.sub.2 CH.sub.3                                                                              H        H                                            S        CH═CHCO.sub.2 CH.sub.3                                                                     H        H                                            ______________________________________                                    


21. A composition of claim 20 wherein the compound is 7-methoxy-1,4-diaza-10-methylphenothiazine.
 22. A composition of claim 20 wherein the compound is 7-hydroxy-1,4-diaza-10H-phenothiazine.
 23. A composition of claim 20 wherein the compound is 7-hydroxy-1,4-diaza-10-methylphenothiazine.
 24. A composition of claim 20 wherein the compound is 8-chloro-1,4-diaza-7-methoxyphenothiazine.
 25. A composition of claim 20 wherein the compound is 8-chloro-7-methoxy-1,4-diaza-10-methylphenothiazine.
 26. A composition of claim 20 wherein the compound is 8-chloro-7-hydroxy-1,4-diaza-10-methylphenothiazine. 